Helical end mill cutter



FIG. 1 is a side elevational view of a helical end mill cutter according to the pressent invention; and,

FIG. 2 is an end, perspective view thereof.

The lower portion of the helical end mill cutter of the present invention is essentially symmetrical and therefore the other side is not illustrated. The upper portion thereof is conical and substantially planar and therefore is not illustrated. 

The ornamental design for a helical end mill cutter, as shown and described. 